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Simplifying (3b + -11) + (b + 4) = 21 Reorder the terms: (-11 + 3b) + (b + 4) = 21 Remove parenthesis around (-11 + 3b) -11 + 3b + (b + 4) = 21 Reorder the terms: -11 + 3b + (4 + b) = 21 Remove parenthesis around (4 + b) -11 + 3b + 4 + b = 21 Reorder the terms: -11 + 4 + 3b + b = 21 Combine like terms: -11 + 4 = -7 -7 + 3b + b = 21 Combine like terms: 3b + b = 4b -7 + 4b = 21 Solving -7 + 4b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 4b = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 4b = 21 + 7 4b = 21 + 7 Combine like terms: 21 + 7 = 28 4b = 28 Divide each side by '4'. b = 7 Simplifying b = 7
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